Nope, not necessarily. Everyone's intestines secretes mucus; it's a normal part of the gut function. It's what allows food to be moved through your intestine. Sometimes, excessive mucus can be caused by bowel disease, but people with "functional" bowel disorders (such as IBS) also notice excessive mucus. It's good to run it past your GI, of course, but in the complete absence of other symptoms, it's not necessarily an indicator of inflammation.